vlib/v/checker/tests/match_expr_with_none_only.vv:2:2: warning: unused variable: `a`
    1 | fn main() {
    2 |     a := match 1 {
      |     ^
    3 |         1 { none }
    4 |         else { none }
vlib/v/checker/tests/match_expr_with_none_only.vv:2:7: error: invalid match expression, must supply at least one value other than `none`
    1 | fn main() {
    2 |     a := match 1 {
      |          ~~~~~~~~~
    3 |         1 { none }
    4 |         else { none }
